Top energy efficient window manufacturers

Choose energy efficient windows and top window manufacturers, but do not forget the importance of their installation. The best windows on the market will lose much of their energy-efficiency if improperly installed.

Top window manufacturers

There are thousands of manufacturers of windows, doors and skylights. Most of them are small manufacturers, producing and selling in a regional scale.

Some small manufacturers may have great windows, but choosing a top window manufacturer – instead of a small and unknown one - may be a clever option, or at least a good starting point.

See, for a list of top window manufacturers.

The best window products

The brand issue can be important, but do not forget that window manufacturers have different products, differing in their quality and prices.

Take that into account, and compare the windows using the Energy Star-NFRC or other window rating system (see Best residential window rating).

Installation & Installers

Rules for a correct window installation
1) Windows should always be installed in the vertical position; 2) The rough opening should be sized properly; make sure it is square and level; 3) Apply adequate flashing under the windows and around; 4) Secure the window with fasteners and check its alignment before anchoring it in the wall; 5) Insulate and air seal the cavity between the rough opening and the window frame. 6) Seal unfinished surfaces. 7) Ensure proper operation before applying the interior trim.

Window installation is particularly important. Do not install the windows (or doors, or skylights) yourself, unless you are absolutely sure of your skills and information. Following classical window installation instructions will not be enough.

Top window manufacturers can help you find an installer and other window service providers near you.

Home improvement stores like Lowe's and Home Depot also offer professional window installation at low cost.

Demand professional certifications... The risk of low performance, water damage and air leakage due to an incorrect installation of the windows is too high to act otherwise.

Window (and doors) manufacturers

Below, we list some top window manufacturers. Many operate worldwide, but most of them have their head-quarters in USA.

Do not forget that manufacturers have different series of windows with different prices and quality levels. And that to choose the best windows you have to consider the Energy Star-NFRC or other rating system, and to select windows that respond to your climate zone (see Windows for cold, hot and mix climates).

List of top energy efficient window manufacturers

Andersen Windows and Doors
Simply the world's largest manufacturer of windows and patio doors.

Marvin Windows and Doors
Marvin offers around 11,000 different standard window sizes, and made-to-order windows and doors, including storm windows.

Milgard Windows
One of the largest window manufacturers of the world. Offers a complete line of vinyl, aluminum, and wood custom-built windows.

Pella Windows and Doors
A world leader in windows and doors.

Wilmmar Windows
A Canadian leader, and a division of Jed-Wen, with a large offer of windows and doors in wood and vinyl.

Other top window manufacturers:

American Craftsman/Andersen
Certainteed
CroftLLC
Jeld-Wen
Gilkey
Gorell
Hess
Kensington
Seaway
Sequel
Simonton
Softlite
Thermal industries